/Engine/Plugins/Animation/AnimationModifierLibrary/Source/AnimationModifierLibrary/Public/CopyBonesModifier.h
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)([BlueprintType](Programming/UnrealArchitecture/Reference/Structs/Specifiers/BlueprintType)) struct FBoneReferencePair
FBoneReference
SourceBone
Bone to get transform from
FBoneReference
TargetBone
Bone to update with the transform copied from SourceBone